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I recall a couple years ago some top MTB Pros were gluing cut up tires onto road shoes (Ryder Hjesdal - bad spelling sorry, and some other Canadian pros if I recall right.) Apparently they liked the stiffer soles. However, I personally think that the difference between a top end MTN shoe and road shoe (both using carbon soles) would be minimal. Comfort could be an issue over long rides. I used road shoes for a couple seasons and I really missed having the toe spikes. I glued on treads, but on steep uphills (especially after rain) it was damn near impossible to run up them - not good in races! So in conclusion, I would say don't worry too much about any power loss.

A M221 shoe is not as stiff as a full carbon road shoe, with the carbon only coming back as far as the start of the arch.

Most high quality road shoes will be stiffer than this, but the ultra stiff shoes will feed more buzz into your body - many of the top shoes have optional stiffeners so you dont have 2 put up with this buzz if you dont want to.

personally I use mountain shoes on my road bike, they are much easier to walk in.
when your talking stiffness in road shoes or mountain shoes, you get what you pay for: a carbon sole will be a lot stiffer than a nylon sole etc donno if there is a difference based on soles, but there is one based on comfort.